I have had this before but it has been a long time. I thought I had a bad tooth but the dentist said no, all are fine. He asked if I had been using "whitening" toothpaste. Yes. He said to throw it away and get Sensodyne because the whitening agents cause tooth sensitivity. I did this and after 3 days, the pain went away. I thought I was home free but it is back. This is unbearable pain and I have no idea what to do about it. It doesn't just hurt with cold or hot, but anything I put in my mouth. This pain is the kind that will bring me to my knees. Anyone else experience tooth pain? It is the right side of my mouth, mostly the top half.